1.3.99.27: 1-hydroxycarotenoid 3,4-desaturase

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For detailed information about 1-hydroxycarotenoid 3,4-desaturase, go to the full flat file.

Reaction

1-hydroxy-3,4-didehydro-1,2-dihydrolycopene

Synonyms

1-HO carotenoid 3,4-dehydrogenase, 1-hydroxy monocyclic carotenoid 3,4-dehydrogenase, acyclic carotenoid 3,4-desaturase, CrtD, DDD_2394, hydroxyneurosporene desaturase, P99-3 CrtD

ECTree

1 Oxidoreductases

1.3 Acting on the CH-CH group of donors

1.3.99 With unknown physiological acceptors

1.3.99.27 1-hydroxycarotenoid 3,4-desaturase

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Results	in table
102	AA Sequence
1	Application
4	Cloned(Commentary)
2	Cofactor
1	Crystallization (Commentary)
13	General Information
4	KM Value [mM]
2	Molecular Weight [Da]
9	Natural Substrates/ Products (Substrates)
15	Organism
5	Pathway
2	pH Optimum
1	Purification (Commentary)
1	Reaction
14	Reference
25	Substrates and Products (Substrate)
2	Subunits
26	Synonyms
1	Systematic Name
2	Temperature Optimum [°C]

Systematic Name

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Systematic Name on EC 1.3.99.27 - 1-hydroxycarotenoid 3,4-desaturase

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1-hydroxy-1,2-dihydrolycopene:acceptor oxidoreductase

The enzymes from Rubrivivax gelatinosus and Rhodobacter sphaeroides prefer the acyclic carotenoids (e.g. 1-hydroxy-1,2-dihydroneurosporene, 1-hydroxy-1,2-dihydrolycopene) as substrates. The conversion rate for the 3,4-desaturation of the monocyclic 1'-hydroxy-1',2'-dihydro-gamma-carotene is lower [2,3]. The enzyme from the marine bacterium strain P99-3 shows high activity with the monocyclic carotenoid 1'-hydroxy-1',2'-dihydro-gamma-carotene [1]. The enzyme from Rhodobacter sphaeroides utilizes molecular oxygen as the electron acceptor in vitro [3]. However, oxygen is unlikely to be the natural electron acceptor under anaerobic conditions.